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Old 07-05-2018, 08:12 PM   #1
Driver_WT
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Rust on Underside of Hood

The hood on my 53 Chevy Truck needs some work on the top side, but not too bad. On the other hand, the underside of the hood is covered with rust, no holes but lots of surface rust. Can I sandblast the underside of the hood, or will that cause problems with the hood? I thought I had seen somewhere that someone had warped their hood by having it sandblasted?

The rust on the underside is too heavy to just sand off.

Thanks.

Wade
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Old 07-05-2018, 08:51 PM   #2
mongocanfly
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Re: Rust on Underside of Hood

A blaster can ruin a body panel if they don't know what they're doing...even then it's a crap shoot....there are liquid options for removing rust....
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Old 07-05-2018, 09:25 PM   #3
_Ogre
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Re: Rust on Underside of Hood

pretty heavy metal on our trucks, i had my whole truk sandblasted
newer vehicles have thin metal and need soda/dryice/walnut shells
the whole bedside of my gmc sierra vibrates when i close the gas door
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Old 07-06-2018, 12:32 AM   #4
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Re: Rust on Underside of Hood

A reputable sandblaster will not destroy it so do your homework and spend the money.
Do NOT use liquid rust removal products as they can leave "latent defects".
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Old 07-06-2018, 02:37 PM   #5
Dan in Pasadena
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Re: Rust on Underside of Hood

My entire truck has been sand based piece by piece by a local shop that someone who buys-restores-sells Tri Five Chevy's uses. That was good enough for me. He sells very high dollar restorations and said he always got good results.

Do what Footstomper recommended - do your homework first.
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Old 07-06-2018, 04:10 PM   #6
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Re: Rust on Underside of Hood

Not to poo-poo on the guys above, but it probably kind of depends on the restoration. Even blasting can leave rust in some areas. And you risk warping.

I've had success with chemical converters (phosphoric acid based), POR15, and even Molasses Baths or Electrolysis.
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Old 07-07-2018, 06:35 AM   #7
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Re: Rust on Underside of Hood

Quote:
Originally Posted by Foot Stomper View Post
A reputable sandblaster will not destroy it so do your homework and spend the money.
Do NOT use liquid rust removal products as they can leave "latent defects".
Is there any way to remove the latent defects from liquid rust removers?
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Old 07-07-2018, 06:41 PM   #8
Dan in Pasadena
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Re: Rust on Underside of Hood

He meant some of the harsh chemical that removed the rust gets stuck in seams and crevices in the metal. Pretty hard to do anything that would assure total removal of this material...which is why I would say to media blast it using a knowledgeable, EXPERIENCED blast shop.
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Old 07-07-2018, 07:44 PM   #9
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Re: Rust on Underside of Hood

Quote:
Originally Posted by Dan in Pasadena View Post
He meant some of the harsh chemical that removed the rust gets stuck in seams and crevices in the metal. Pretty hard to do anything that would assure total removal of this material...which is why I would say to media blast it using a knowledgeable, EXPERIENCED blast shop.
Exactly.

Furthermore, what can't be removed my media blasting should be coated in 2k epoxy primer. After completion, any suspect seems should be treated with a penetrating wax spray to encapsullate the rust, keeping out air and moisture which fuels rust.
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Old 07-08-2018, 02:19 PM   #10
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Re: Rust on Underside of Hood

I'd agree that if you go to a media blaster or sand blaster do your homework to make sure that the person who is doing the sand blasting is well experienced with sheet metal.

One of the local to me powder coating shops (we seem to have several that stay busy) has one guy that the manager says she trusts to do sheet metal and he does all of the car sheet metal. They do a lot of bodies on rotisseries for some of the local resto shops.
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